tercul-backend/repositories/cached_work_repository.go

package repositories

import (
	"context"
	"time"

	"tercul/cache"
	"tercul/logger"
	"tercul/models"
)

// CachedWorkRepository wraps a WorkRepository with caching functionality
type CachedWorkRepository struct {
	*CachedRepository[models.Work]
	workRepo WorkRepository
}

// NewCachedWorkRepository creates a new CachedWorkRepository
func NewCachedWorkRepository(
	workRepo WorkRepository,
	cache cache.Cache,
	keyGenerator cache.KeyGenerator,
	cacheExpiry time.Duration,
) *CachedWorkRepository {
	if keyGenerator == nil {
		keyGenerator = &simpleKeyGenerator{prefix: "tercul:"}
	}

	if cacheExpiry == 0 {
		cacheExpiry = 30 * time.Minute // Default expiry of 30 minutes
	}

	return &CachedWorkRepository{
		CachedRepository: NewCachedRepository[models.Work](
			workRepo,
			cache,
			keyGenerator,
			"work",
			cacheExpiry,
		),
		workRepo: workRepo,
	}
}

// FindByTitle finds works by title (partial match)
func (r *CachedWorkRepository) FindByTitle(ctx context.Context, title string) ([]models.Work, error) {
	if !r.cacheEnabled {
		return r.workRepo.FindByTitle(ctx, title)
	}

	cacheKey := r.keyGenerator.QueryKey(r.entityType, "title", title)

	var result []models.Work
	err := r.cache.Get(ctx, cacheKey, &result)
	if err == nil {
		// Cache hit
		logger.LogDebug("Cache hit for FindByTitle",
			logger.F("entityType", r.entityType),
			logger.F("title", title))
		return result, nil
	}

	// Cache miss, get from database
	logger.LogDebug("Cache miss for FindByTitle",
		logger.F("entityType", r.entityType),
		logger.F("title", title))

	result, err = r.workRepo.FindByTitle(ctx, title)
	if err != nil {
		return nil, err
	}

	// Store in cache
	if err := r.cache.Set(ctx, cacheKey, result, r.cacheExpiry); err != nil {
		logger.LogWarn("Failed to cache FindByTitle result",
			logger.F("entityType", r.entityType),
			logger.F("title", title),
			logger.F("error", err))
	}

	return result, nil
}

// FindByAuthor finds works by author ID
func (r *CachedWorkRepository) FindByAuthor(ctx context.Context, authorID uint) ([]models.Work, error) {
	if !r.cacheEnabled {
		return r.workRepo.FindByAuthor(ctx, authorID)
	}

	cacheKey := r.keyGenerator.QueryKey(r.entityType, "author", authorID)

	var result []models.Work
	err := r.cache.Get(ctx, cacheKey, &result)
	if err == nil {
		// Cache hit
		logger.LogDebug("Cache hit for FindByAuthor",
			logger.F("entityType", r.entityType),
			logger.F("authorID", authorID))
		return result, nil
	}

	// Cache miss, get from database
	logger.LogDebug("Cache miss for FindByAuthor",
		logger.F("entityType", r.entityType),
		logger.F("authorID", authorID))

	result, err = r.workRepo.FindByAuthor(ctx, authorID)
	if err != nil {
		return nil, err
	}

	// Store in cache
	if err := r.cache.Set(ctx, cacheKey, result, r.cacheExpiry); err != nil {
		logger.LogWarn("Failed to cache FindByAuthor result",
			logger.F("entityType", r.entityType),
			logger.F("authorID", authorID),
			logger.F("error", err))
	}

	return result, nil
}

// FindByCategory finds works by category ID
func (r *CachedWorkRepository) FindByCategory(ctx context.Context, categoryID uint) ([]models.Work, error) {
	if !r.cacheEnabled {
		return r.workRepo.FindByCategory(ctx, categoryID)
	}

	cacheKey := r.keyGenerator.QueryKey(r.entityType, "category", categoryID)

	var result []models.Work
	err := r.cache.Get(ctx, cacheKey, &result)
	if err == nil {
		// Cache hit
		logger.LogDebug("Cache hit for FindByCategory",
			logger.F("entityType", r.entityType),
			logger.F("categoryID", categoryID))
		return result, nil
	}

	// Cache miss, get from database
	logger.LogDebug("Cache miss for FindByCategory",
		logger.F("entityType", r.entityType),
		logger.F("categoryID", categoryID))

	result, err = r.workRepo.FindByCategory(ctx, categoryID)
	if err != nil {
		return nil, err
	}

	// Store in cache
	if err := r.cache.Set(ctx, cacheKey, result, r.cacheExpiry); err != nil {
		logger.LogWarn("Failed to cache FindByCategory result",
			logger.F("entityType", r.entityType),
			logger.F("categoryID", categoryID),
			logger.F("error", err))
	}

	return result, nil
}

// FindByLanguage finds works by language with pagination
func (r *CachedWorkRepository) FindByLanguage(ctx context.Context, language string, page, pageSize int) (*PaginatedResult[models.Work], error) {
	if !r.cacheEnabled {
		return r.workRepo.FindByLanguage(ctx, language, page, pageSize)
	}

	cacheKey := r.keyGenerator.QueryKey(r.entityType, "language", language, page, pageSize)

	var result PaginatedResult[models.Work]
	err := r.cache.Get(ctx, cacheKey, &result)
	if err == nil {
		// Cache hit
		logger.LogDebug("Cache hit for FindByLanguage",
			logger.F("entityType", r.entityType),
			logger.F("language", language),
			logger.F("page", page),
			logger.F("pageSize", pageSize))
		return &result, nil
	}

	// Cache miss, get from database
	logger.LogDebug("Cache miss for FindByLanguage",
		logger.F("entityType", r.entityType),
		logger.F("language", language),
		logger.F("page", page),
		logger.F("pageSize", pageSize))

	result_ptr, err := r.workRepo.FindByLanguage(ctx, language, page, pageSize)
	if err != nil {
		return nil, err
	}

	// Store in cache
	if err := r.cache.Set(ctx, cacheKey, result_ptr, r.cacheExpiry); err != nil {
		logger.LogWarn("Failed to cache FindByLanguage result",
			logger.F("entityType", r.entityType),
			logger.F("language", language),
			logger.F("page", page),
			logger.F("pageSize", pageSize),
			logger.F("error", err))
	}

	return result_ptr, nil
}

// GetWithTranslations gets a work with its translations
func (r *CachedWorkRepository) GetWithTranslations(ctx context.Context, id uint) (*models.Work, error) {
	if !r.cacheEnabled {
		return r.workRepo.GetWithTranslations(ctx, id)
	}

	cacheKey := r.keyGenerator.QueryKey(r.entityType, "with_translations", id)

	var result models.Work
	err := r.cache.Get(ctx, cacheKey, &result)
	if err == nil {
		// Cache hit
		logger.LogDebug("Cache hit for GetWithTranslations",
			logger.F("entityType", r.entityType),
			logger.F("id", id))
		return &result, nil
	}

	// Cache miss, get from database
	logger.LogDebug("Cache miss for GetWithTranslations",
		logger.F("entityType", r.entityType),
		logger.F("id", id))

	result_ptr, err := r.workRepo.GetWithTranslations(ctx, id)
	if err != nil {
		return nil, err
	}

	// Store in cache
	if err := r.cache.Set(ctx, cacheKey, result_ptr, r.cacheExpiry); err != nil {
		logger.LogWarn("Failed to cache GetWithTranslations result",
			logger.F("entityType", r.entityType),
			logger.F("id", id),
			logger.F("error", err))
	}

	return result_ptr, nil
}

// ListWithTranslations lists works with their translations
func (r *CachedWorkRepository) ListWithTranslations(ctx context.Context, page, pageSize int) (*PaginatedResult[models.Work], error) {
	if !r.cacheEnabled {
		return r.workRepo.ListWithTranslations(ctx, page, pageSize)
	}

	cacheKey := r.keyGenerator.QueryKey(r.entityType, "list_with_translations", page, pageSize)

	var result PaginatedResult[models.Work]
	err := r.cache.Get(ctx, cacheKey, &result)
	if err == nil {
		// Cache hit
		logger.LogDebug("Cache hit for ListWithTranslations",
			logger.F("entityType", r.entityType),
			logger.F("page", page),
			logger.F("pageSize", pageSize))
		return &result, nil
	}

	// Cache miss, get from database
	logger.LogDebug("Cache miss for ListWithTranslations",
		logger.F("entityType", r.entityType),
		logger.F("page", page),
		logger.F("pageSize", pageSize))

	result_ptr, err := r.workRepo.ListWithTranslations(ctx, page, pageSize)
	if err != nil {
		return nil, err
	}

	// Store in cache
	if err := r.cache.Set(ctx, cacheKey, result_ptr, r.cacheExpiry); err != nil {
		logger.LogWarn("Failed to cache ListWithTranslations result",
			logger.F("entityType", r.entityType),
			logger.F("page", page),
			logger.F("pageSize", pageSize),
			logger.F("error", err))
	}

	return result_ptr, nil
}